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ofs. BRADLEY. ALARM BELL.

No. 515,991. Patented Mar. 6, 1894.

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lhvi'rnn STATES CHARLES S. BRADLEY, OF PORTLAND, OREGON, ASSIGNOR JOHNT. STONE, OF SAME PLACE.

TATENT @rrion.

'ro HIMSELF AND ALARM-BELL.

$PECIFICATION forming part of Letters Patent No. 515,991, dated March 6,1894. Application filed August 17 1893- Serial No. 483i37 (N0 l- To (tZZwhom it may concern:

Be it known that I, CHARLES S. BRADLEY, of Portland, in the county ofMultnomah and State of Oregon, have invented a new and usefulImprovement in Alarm-Bells,of which the :Eollowing is a full, clear, andexact descripion.

My invention relates to an improvement in alarm bells, and it has forits object to provide a bell capable of use as a merchants call hell, oras a burglar alarm, or for like purposes, the bell being so constructedand capable of being so attached to'a door or like object that when thedoor is closed the drivmg mechanism of the bell will-be automaticallywound, and whereby the moment the door is opened the striking mechanismwill be set in operation, also automatically.

A further object of the invention is to provide an alarm bell which neednot be wound by hand at any time, and which will be at all times readyfor use.

Another feature of the invention is to provide a bell of the characterabove set forth which will necessitate but few working parts, andwherein the said parts will be simple and durable in construction,rendering the bell exceedingly economic.

The invention consistsin the novel construction and combination of theseveral parts, as will be hereinafter fully set forth and pointed out inthe claims.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar figures and letters of referenceindicate corresponding parts in all the views.

Figure 1 is a horizontal section through a portion of a door and doorjamb, the door being closed; said figure also illustrates theapplication of the improved bell to the door. Fig. 2 is a section takenpractically on the line 2-2 of Fig. 3, illustrating the operativemechanism of the bellin plan. Fig. 3 is a section through the bell andbase plate, said section being taken on the line 3-3 of Fig.2, theoperative mechanism being shown in elevation, with the exception of theplunger, which is in section; and Figs. 4 and 5 are detail views of thebell, Fig. =l representing a stop mechanism and Fig. 5 the strikingmechanism.

What may be termed the framing of the bell consists of a back plate Aand a front plate B, the front plate being centrally located withrespect to the back plate, and it is of much less diameter than the backplate. The back and front plates are properly spaced through the mediumof connecting posts 10, and usually the front plate is provided with abracket or extension B, upon which bracket or extension the hell orgong1l,is secured in any suitable or approved manner, the hell or gongbeing made at its margin to somewhat closely approach the back plate.The back plate is provided with lugs 12, located near one another, butbetween the lugs a recess 13, is made. The lugs are bent practically atan angle to the back plate and the back plate is adapted to be securedto the inner side of a door C, as shown in Fig. 1, the lugs 12, beingmade to firmly engage with the inner edge of the door, or that oppositethe jamb 0' upon which the door is swung; and when the door is closedthe lugs on the back plate will be between thedoor and the jamb, andrecesses 14, may be produced in the jamb, to just reoeive the lugs whenthe door is closed.

The hammer usually comprises two links, an outer long link 15 and aninner short one 16. The inner link is secured upon a spindle 17,journaled between the front and back plates, which spindle is providedwith a pinion 18. The longer link is pivotally attached to the shorterone, and is provided at its inner end with a spur 15, which when thelinks are swung in one direction will engage with the spindle andmaintain the two links in longitudinal alignment. When however, the spuris not brought in engagement with the spindle one link can turn upon theother. The longer link 15, is usually provided with a knob 19 at itsouter end. The striking pinion 18 on the striking spindle is made tomesh with a gear 20, mounted to turn between the front and back plates,the gear having secured to it a pinion 21; and the pinion 21 meshes witha second gear 22, likewise held to turn between the front and backplates, the said second gear being provided with a pinion 23. Thispinion 23, meshes with a master gear 24, the said master gear beingloosely mounted upon a post 25, said post extending. from the front tothe back plate; and the master gear is provided upon one of its faceswith a spring-pressed pawl 26, and the said pawl is held constantly inengagement with a ratchet wheel 27, located on the post 25, and the postadjacent to the ratchet wheel has projected from it an arm 28, and thesaid arm is attached to a spring 29, the spring being secured at one endto the backplataasshown in Fig.2. The tendency of the spring is to holdthe ratchet wheel against the pawl, and in the event the arm 28, isforced'in one direction the spring 29 will be put under tension and theratchet wheel will be turned a certain number of teeth, and upon the arm28 being released the spring will restore the arm to its normalposition, and in so doing will turn the master wheel and likewise theentire train of gearing connecting the master wheel with the strikingpinion on the striking arbororspindle, and therefore the striking linkswill be revolved and will be brought into engagement with the gong andsound an alarm. The length of time the alarm will be sounded underordinary circumstances will be equivalent to the time occupied by thespring in reaching its normal position.

The spring 29 is brought under tension through the medium of a plunger30, said plunger being held to slidein suitable guides upon the innerface of the back plate, and the said plunger is made to pass over therecess 13 in the back plate, and the plunger is provided in its outerend with a head 31, extending in the same direction as the lugs 12 ofthe back plate. The inner end of the plunger is provided with a slot 32,through which slot the post 25 upon which the master wheel is mounted ispassed. The plunger is provided at its inner end with two pins 33 and34, located at opposite sides of the arm 28.

In operation when the bell is secured to a door, and the door is closedas shown in Fig. 1, the plungei' will be pressed inward, and the shaftorpost of the master wheel ivill be turned and the spring 29 placed undertension; the parts will be held in this position until the door isopened, as shown in dotted lines in Fig. 1, and at that time the head ofthe plunger being released, the spring will force the plunger outward,and in restoring the plunger to its outer position will revolve the post25, and therefore turn the chain of gearing communicating with thestriking arbor and cause the striker arms or links to move, as shown inFig. 5. Thus at each time that the door is opened an alarm will beantomatically sounded, and each time the door is closed the mechanism ofthe gong oralarm will be wound or placed in operative order simultaneously, and at no time is it necessary to wind the mechanism by hand.

In the event the alarm is not needed alock lever 35 pivoted upon theback plate may be brought to an engagement with a notch 36, produced inthe plunger, the lever engaging with the notch'when the plunger is inits 1nner position, and a series of graduated notches may be produced inthe plunger, as shown in Fig. 4., in order that by engaging the leverwith certain of the notches the outer movement of the plunger will belimited, and consequently the duration. of the alarm may be varied.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In an alarm bell, a gong, a hammer adapted forcontact with the gong, a master wheel, a train of gearing connecting themaster wheel and hammer, a spring-pressed winding arm, and a plungeroperating said arm when moved in one direction and releasing the armwhen moved in an opposite direction, substantially as shown anddescribed.

2. In an alarm bell, the combination, with a gong or like alarm, ahammer adapted for engagement with the gong, a master wheel, and gearingconnecting the master wheel with the hammer, of a spring-controlledwinding mechanism connected with the master wheel, a plunger operatingthe winding mechanism when moved in one direction, and means,substantially as shown and described, whereby the winding mechanism andplunger move 7 in unison both at the winding and the unwinding of themechanism, as and for the purpose specified.

3. In an alarm bell, the combination, with a gong or other bell, ahammer, a master wheel, and a train of gearing connecting the hammerwith the master wheel, of a springcontrolled winding mechanism connectedwith the master wheel, a plunger operating upon the winding mechanism,said plunger being capable of sliding movement and of being operatedupon by the winding mechanism, and a stop whereby the outward movementof the plunger may be limited, as and for the purpose specified.

4. In an alarm bell, the combination, with a door or like object and thejamb upon which the door is hung, of a bell provided with a windingmechanism, a hammer, a connection between the winding mechanism and thehammer, and a plunger operating upon the winding mechanism and havingmovement to and from the mechanism, the plunger being provided with ahead located between the door and the jamb, whereby when the door isclosed the plunger is pushed inward and the winding mechanism is wound,and when the door is opened the plunger is released and acted upon bythe winding mechanism, simultaneously with its operation upon thehammer, as specified. CHARLES S. BRADLEY.

lVitnesses:

S. H. HAINEs, T. O. HUMPHREY.

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